From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Wind tunnel tests performed on the Ulster T.T. Car, a Bentley B.35.AE.
| Identifier | ExFiles\Box 160\2\ scan0199 | |
| Date | 22th August 1934 | |
| x4578 To Sg.{Arthur F. Sidgreaves - MD} from EV.{Ivan Evernden - coachwork} To L.H.S.{Lord Herbert Scott - Chair} (for circulation of C.S.C.) To W.Or. Bn.{W.O. Bentley / Mr Barrington} Hs.{Lord Ernest Hives - Chair} E.{Mr Elliott - Chief Engineer} Rm{William Robotham - Chief Engineer} Re Wind Tunnel Tests. Ulster T.T. Car. E.R. Hall. Bentley B.35.AE. We have been able to carry out tests on the wind resistance of the car which Mr. E.R. Hall proposes to enter for the Ulster Tourist Trophy Race. The smaller Wind Tunnel at Messrs. Vickers of Weybridge was used for 1 1/4 days. The model was made by Messrs. Offords who built the body in question, and the flat plate method of testing was employed. As a check on the tests, the model of the Standard Saloon was tested (Test 1). Next we tested the model in the condition in which it was first taken to Brooklands by Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} and gave a lap speed of 90 M.P.H. (Test 2). Test 3 was of the car in racing trim. Test 4 represented the car as finally tested on Brooklands, and from this all the subsequent performances have been computed. It is interesting to note that the performances of the car as originally tested on Brooklands and as finally tested agree extremely closely with the performances expected from the wind tunnel tests (see appendix). Subsequent modifications, resulting in Test 10, (illustrations 2, 3 & 4), increased the lap speed by 4.8 M.P.H. which is at first sight very little, but is equivalent to 17.25 H.P. | ||